*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19871
198831
19892
199033
199168
19927
199319
199412
199517
199629
19970
19980
19993
20000
20013
20021
20030
20041
20055
200613
20072
20083
20091
2010125
20116
20122
20131
20142
20152
20161
20172
20180
20192
20200
20210
Total396